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Description of Business (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jul. 18, 2017
Jul. 12, 2017
Jun. 30, 2016
Corporate Information, Status of Operations and Management Plans      
Net proceeds from the issuance of common stock     $ 57,818
Subsequent event | Common Stock      
Corporate Information, Status of Operations and Management Plans      
Number of common stock issued from underwriting agreement   21,122,449  
Price per share of common stock issued (in dollars per share)   $ 12.25  
Gross proceeds from issue of common stock before deducting underwriting discounts and commissions   $ 258,800  
Net proceeds from the issuance of common stock $ 243,200